Wi-Fi Direct doesn't connect devices on WinRT

I'm trying to connect two devices by Wi-Fi Direct but these are not connected. I tested both in my application and in Proximity Sample, the same error occurs:

• "Error this operation returned because the timeout period expired. (Exception from HRESULT: 0x80070584)" - Beside whom requested the connection
• "A device attached to the system is not Functioning. (Exception from HRESULT: 0x8007001F)" - the side of whoever accepts the connection.

This happens during the call:

StreamSocket socket = await PeerFinder.ConnectAsync(peer);

Sometimes the devices are connected, but in most cases doesn't connect.

Someone is having the same problem? Is there anyway to fix this?